Cinch is a fully featured WPF MVVM framework that makes it easier to develop rich MVVM WPF applications. It also provides UI services/threading/unit tests helpers and much more. Cinch is a WPF ModelView-ViewModel framework that takes the UI services route to provide a rich WPF MVVM framework that comes with several standard services out of the box as well as Unit test services.

Glade is a RAD tool to enable quick & easy development of user interfaces for the GTK+ toolkit and the GNOME desktop environment. The user interfaces designed in Glade are saved as XML, and by using the GtkBuilder GTK+ object these can be loaded by applications dynamically as needed. By using GtkBuilder, Glade XML files can be used in numerous programming languages including C, C++, C#, Vala, Java, Perl, Python,and others.

This Dreamweaver extension is an advanced tool that creates accordion menus on your website easily. Accordion Menu Advancer has an intuitive GUI and extensive library of free professionally designed templates. This tool generates the light-weight, cross-browser, SEO-friendly multi-level CSS menus. It saves your time as it does not require any css/javascript hand coding. Full control on all aspects at menu creation guarantees perfect results. With its real-time preview function you can always see how your menu will look in a browser.

Parasite is a debugging and development tool that runs inside your GTK+ application's process. It can inspect your application, giving you detailed information on your UI, such as the hierarchy, X window IDs, widget properties, and more. You can modify properties on the fly in order to experiment with the look of your UI.

wxPython is a GUI toolkit for the Python programming language. It allows Python programmers to create programs with a robust, highly functional graphical user interface, simply and easily. It is implemented as a Python extension module (native code) that wraps the popular wxWidgets cross platform GUI library, which is written in C++.